Who would I be if I could be a character from a book...uhm...hmm.
I'll go with Anne Rice's über emo misanthropic brat Lestat. Responsibilities slide off him like oil on Teflon. He's unquestionably bold and daring to the detriment of everyone around him. He has amazing adventures with more amazing people...and gives no shits for how badly he wrecks them. The people and the places, that is. His selfishness lays low immortals and gods (you know that is a special level of It's Always All About Me when you're worse than a god). When he's overcome with self-pity, holed up or buried, wallowing in his bad hair day, one of his Stockholm victims comes to his rescue. Even when his peers attempt to hold him accountable, his charm and insouciant ways somehow lead him to be the hero of the moment or at least of the illusion.
Lestat is so completely who I am not, that it would be a gas to live his life with his utter lack of morals.